Subtract 7/90 from 7/18
7/18 - 7/90 is 14/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
7/18 = 7 × 5/18 × 5 = 35/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
7/90 = 7 × 1/90 × 1 = 7/90 - Subtract the two like fractions:
35/90 - 7/90 = 35 - 7/90 = 28/90 - After reducing the fraction, the answer is 14/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/18-7/90 7/18-14/90 7/36-7/90 21/18-7/90 7/18-21/90 7/54-7/90 35/18-7/90 7/18-35/90 7/90-7/90 49/18-7/90 7/18-49/90